Assessing Abnormal Proximal Junctional Angles in Adult Spinal Deformity

作者：Marc Khalifé, Renaud Lafage, Alan H. Daniels, Bassel G. Diebo, Jonathan Elysée, Christopher P. Ames, Shay R. Bess, Douglas C. Burton, Robert K. Eastlack, Munish C. Gupta, Richard A. Hostin, Khaled M. Kebaish, Han-Jo Kim, Eric O. Klineberg, Gregory M. Mundis, David O. Okonkwo, Olivier Gille, Pierre Guigui, Emmanuelle Ferrero, Wafa Skalli, Ayman Assi, Claudio Vergari, Christopher I. Shaffrey, Justin S. Smith, Frank Schwab, Virginie Lafage, International Spine Study Group · 发表于：Spine · 年份：2024 · DOI：10.1097/brs.0000000000005141 · 被引用次数：6 · 研究领域：Scoliosis diagnosis and treatment、Spine and Intervertebral Disc Pathology、Cervical and Thoracic Myelopathy

STUDY DESIGN: Multicentric retrospective study of prospectively collected data. OBJECTIVE: On the basis of normative data from a cohort of asymptomatic volunteers, this study sought to determine the rate of abnormal values of proximal junctional angles (PJA) in adult spinal deformity (ASD) surgery patients, and compare it with PJK rate. SUMMARY OF BACKGROUND DATA: Proximal junctional kyphosis (PJK) definition does not take the vertebral level into account. PATIENTS AND METHODS: This study included 721 healthy volunteers and 824 ASD surgery patients with two-year postoperative follow-up. Normative values for each disc and vertebral body between T1 and T12 were analyzed, then normative values for PJA at each thoracic level were defined in the volunteer cohort as the mean±2SD. PJA abnormal values at the upper instrumented vertebra (UIV) were compared with Glattes' and Lovecchio's definitions for PJK in the ASD population at two years. RESULTS: Mean age was 37.7±16.3 in the volunteer cohort, with 50.5% of females. Mean thoracic kyphosis (TK) was -50.9±10.8°. Corridors of normality included PJA greater than 20° between T3 and T12. Mean age was 60.5±14.0 years in the ASD cohort, with 77.2% of females. Mean baseline TK was -37.4±19.9°, with a significant increase after surgery (-15.6±15.3°, P <0.001). There was 46.2% of PJK according to Glattes' versus 8.7% according to Lovecchio's and 22.9% of kyphotic PJA compared with normative values ( P <0.001). CONCLUSION: This study provides ...